| 摘要 |
A bias T device ( 20 ) and a method for combining a first DC signal with a second RF signal is disclosed. The device ( 20 ) is provided with a first signal splitting means ( 30 ) in the form of a hybrid 90 degree (quadrature) coupler having at least two isolated transmission lines ( 34,40 ). The first signal splitting means ( 30 ) is adapted to receive said first signal at one input ( 22 ) and said second signal at another input ( 24 ). A second signal splitting means ( 32 ) having at least two isolated transmission lines ( 34', 40' ) is also provided. Said second signal splitting means ( 32 ) is coupled to said first signal splitting means ( 30 ) such that the respective sets of transmission lines ( 34, 34', 40, 40' ) comprise isolated signal routes ( 70, 72 ) through said device ( 20 ). An output ( 26 ) provides an output signal comprising a combination of said first DC signal and said second RF signal. A coupling effect between at least two of said transmission lines ( 34, 34', 40, 40' ) is used to combine said first signal with said second signal.
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